Requests to access SCP-2XXX by personnel needs to be authorized by Level 3 or higher employees and accompanied by said employee.

Seems really oddly worded, rework the sentence a bit.

Codes entered to SCP-2XXX-1 and SCP-2XXX-2 must be monitored as well.

You can just say they have to be recorded. Also the 'as well' comes off as casual. Stay with a clinical tone.

The keypad is black in color, and appears as the conventional keypad on a keyboard.

This sentence is redundant. Unless the color is significant to its anomalous effect then leave it out. Clinical tone refers to stating what needs to be said clearly with little word padding.

When on, it shows a video background, a feature found on most karaokes, and the word 'SELECT' in a font face reminiscent of 'Comic Sans MS'.

Too many commas, try shortening the sentence.

As with normal karaokes, the television will display the title of the song that the current number combination corresponds to, even before submission.

Again, lot of redundant wording. You can shorten this easily. "SCP-2XXX will display a number of songs, depending on the combination."

SCP-2XXX-2 is a black microphone, with another keypad, albeit looking like one from a remote control, and an LCD display similar to a calculator's.

Again, too many commas. Either shorten the sentence or break it in two.

The keypad behaves exactly like the TV's keypad, minus the operational keys.

If the TV is SCP-2XXX-1, then address it as such.

The microphone seems to have a voice-absorbing function, where the user's voice will be inaudible whenever they speak into the microphone, and only the replicated voice can be heard.

Commas. Also, don't say it "seems to have". If it absorbs sound waves entirely then state if it does or doesn't, an effect like that shouldn't have a grey area.

SCP-2XXX-3 is a book, 30 centimeters in length and 20 centimeters in width. The thickness in appearance is roughly 10 centimeters.

I feel like stating the measurements is a bit redundant. You can call it a book and no one's going to judge you for not putting in measurements.

Contained in the book are numerous codes for every song ever and will be created.

This is oddly worded.

It has combinations for each song theorized to never end due to the anomalous property of the book: to never end.

Again, really oddly worded.

SCP-2XXX-4 is another book, smaller than the song book. Its dimensions are the exact same with SCP-2XXX-3's.

Smaller then SCP-2XXX-3 but has the exact same dimensions.

The object's color, instead of SCP-2XXX-3's dandelion, is a light blue color, also ringed with black.

Are these details really necessary? Knowing that the SCP has a slightly different yellow isn't going to make it more interesting, it just adds more confusion.

The codes differ as they stand for sentient beings, and when entered to SCP-2XXX-2, can replicate the sound of their voices.

I don't recall SCP-2XXX-2 being able to replicate voices. It is never stated in the paragraph that SCP-2XXX-2 has that effect.

All experiments performed with this object is to be filed in the test log.

When you say "this object" I can only assume you mean SCP-2XXX-4, in which case why only that SCP? Shouldn't you add all of them?

it was immediately contained in the nearest Site, which incidentally was in Manila

Lots of redundant wording. Can be easily summed as "SCP-2XXX was contained immediately in Site-43 located in Manila."

revealed the creation process of the machine and the books

This right here is a problem. Nothing grammatical but story-wise. When telling a story a reader is able to make a prediction or judgement on what they think will happen next based on the information they are given.

What you just wrote is essentially spoiling the end to a movie. Instead to build tension and excitement in the reader, it is more effective to not say anything and just state that these papers were found in a desk.

The reader can learn from the pieces of paper what happened and how the SCP was created without the help of the Foundation blatantly telling them. This can create intrigue and cause the reader to desire more information, making them in turn like your story.

First, thank you for posting this in the draft forum and making your own sandbox. Most users when they first get accepted into the wiki try to immediately get to work on a draft and post without feedback (I'm guilty of this too). So you get brownie points for actually seeking feedback. :)

However, if you were to post this SCP as is I would downvote. Why?

Overall the SCP is just a karaoke set with multiple anomalous properties. An object (or multiple objects) with a set of random abilities is not interesting. In my last point I stated about how to tell a story. That's what is expected from SCP articles nowadays, a good story.

What you have given me is an article with barely any story with four items that have random abilities with no coherent link. What story you do have is only told through four pieces of paper, most of which even still barely give a lot of information.

What I Recommend: First off, fix the mistakes I noted above in the grammar errors, those will be instant downvotes for a lot of users.

Second, try to tell a story through your anomalous items. What feeling are you trying to invoke in the reader? Are you trying to scare me? Are you trying to make me feel intrigued at its origins? Are you trying to relate to pop-culture singers in off-putting sense? Find what feeling you want to invoke and exploit it as best you can.

Keep in mind most first articles don't usually succeed. So if you aren't really feeling like this one won't make the cut then don't afraid to branch out to new ideas. Good luck!

in the first line of description, the the line "henforth reffered to as" to simply "reffered to as"
the word henceforth seems a little unproffesional and too personel. also the collapsible with level three clearance requied, omit it. just put it in the appendium(is that how you spell it?)
the level three clearance seems as though you are begging to be taken seroiusly and just ruins the effects.